Bluebird Box House with viewing window is made of insect and rot resistant premium cedar and stainless steel screws. In addition to featuring extra air vents, clean-out doors, elevated mesh floor, predator guard, fledgling skerfs, and a 1 ½ inch entry hole, this house has a stay-clear crack resistant acrylic viewing window. This bluebird house can be pole or flush mounted, and includes a water-based protective stain and Nature's Way Bird Products' exclusive 5 year warranty!